Question 119General Subjects - Assistant Engineer70% to pass
The primary reason low-pressure evaporators produce distillate more efficiently, and with less scale formation, than high-pressure evaporators is _______________.
AI Explanation
The correct answer is D) evaporation is accomplished in a vacuum.
Low-pressure evaporators operate in a vacuum, which lowers the boiling point of the feed water. This allows the water to evaporate at a lower temperature compared to high-pressure evaporators. Evaporating at a lower temperature results in less scale formation, as the solubility of dissolved salts is higher at lower temperatures. Additionally, the vacuum reduces the energy required for evaporation, making the process more efficient.
The other options are incorrect because they do not directly address the key reason for the improved efficiency and reduced scale formation in low-pressure evaporators. The temperature of the incoming feed (A) and the latent heat of evaporation (B) are not the primary factors, and evaporation in a submerged medium (C) is not a characteristic of low-pressure evaporators.
Related Questions
#117 Which of the following conditions can cause high salinity of the distillate due to sea water leakage in the illustrated device? Illustration MO-0110 #118 If the demister used in the device shown in the illustration is improperly installed, which of the following will occur? Illustration MO-0110 #120 In which of the following fresh water generators would an air ejector be unnecessary? #121 With regard to fresh water generators, what statement concerning brine is true? #122 In the production of fresh water from sea water through a process of heating and cooling, the cooling phase of production is usually called _______________.